using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class dialogManager : MonoBehaviour
{
    [Header ("Main Settings")]
    [Space]

    public bool dialogSystemEnabled = true;

    public int dialogScene;

    public bool saveCurrentDialogContentToSaveFile = true;

    public LayerMask layerToPlaceObjects;

    [Space]
    [Header ("Dialog Content System List Settings")]
    [Space]

    public List<dialogContentSystem> dialogContentSystemList = new List<dialogContentSystem> ();

    [Space]
    [Header ("Prefabs List")]
    [Space]

    public GameObject dialogContentPrefab;
    public GameObject externalDialogPrefab;

    [HideInInspector] public GameObject lastObjectInstantiated;


    public const string mainManagerName = "Dialog Manager";

    public static string getMainManagerName ()
    {
        return mainManagerName;
    }


    private static dialogManager _dialogManagerInstance;

    public static dialogManager Instance { get { return _dialogManagerInstance; } }

    bool instanceInitialized;

    public void getComponentInstance ()
    {
        if (instanceInitialized) {
            //			print ("already initialized manager");

            return;
        }

        if (_dialogManagerInstance != null && _dialogManagerInstance != this) {
            Destroy (this.gameObject);

            return;
        }

        _dialogManagerInstance = this;

        instanceInitialized = true;
    }

    void Awake ()
    {
        getComponentInstance ();
    }

    public void getAllDialogContentSystemOnLevel ()
    {
        dialogContentSystemList.Clear ();

        dialogContentSystem [] newDialogContentSystemList = FindObjectsOfType<dialogContentSystem> ();

        foreach (dialogContentSystem currentDialogContentSystem in newDialogContentSystemList) {
            if (!dialogContentSystemList.Contains (currentDialogContentSystem)) {
                dialogContentSystemList.Add (currentDialogContentSystem);
            }
        }
    }

    public void getAllDialogContentOnLevelAndAssignInfo ()
    {
        getAllDialogContentSystemOnLevel ();

        int dialogContentID = 0;

        for (int i = 0; i < dialogContentSystemList.Count; i++) {
            if (dialogContentSystemList [i] != null) {

                dialogContentSystemList [i].assignIDToDialog (dialogContentID);

                dialogContentSystemList [i].assignDialogContentScene (dialogScene);

                dialogContentID++;
            }
        }

        updateComponent ();
    }

    public void clearDialogContentList ()
    {
        dialogContentSystemList.Clear ();

        updateComponent ();
    }

    public dialogContentSystem getDialogContentSystem (int dialogContentID, int dialogContentScene)
    {
        int dialogContentSystemListCount = dialogContentSystemList.Count;

        //Return the element on scene currently found by ID
        for (int i = 0; i < dialogContentSystemListCount; i++) {
            dialogContentSystem currentDialogContentSystem = dialogContentSystemList [i];

            if (currentDialogContentSystem != null) {
                if (currentDialogContentSystem.getDialogContentScene () == dialogContentScene && currentDialogContentSystem.getDialogContentID () == dialogContentID) {

                    return currentDialogContentSystem;
                }
            }
        }

        return null;
    }

    public void instantiateDialogContentSystem ()
    {
        instantateObjectOnLevel (dialogContentPrefab);
    }

    public void instantiateExternalDialogSystem ()
    {
        instantateObjectOnLevel (externalDialogPrefab);
    }

    public void instantateObjectOnLevel (GameObject objectToInstantiate)
    {
        Vector3 positionToInstantiate = Vector3.zero;

        Camera currentCameraEditor = GKC_Utils.getCameraEditor ();

        if (currentCameraEditor != null) {
            Vector3 editorCameraPosition = currentCameraEditor.transform.position;
            Vector3 editorCameraForward = currentCameraEditor.transform.forward;

            RaycastHit hit;

            if (Physics.Raycast (editorCameraPosition, editorCameraForward, out hit, Mathf.Infinity, layerToPlaceObjects)) {
                positionToInstantiate = hit.point + Vector3.up * 0.05f;
            }
        }

        if (objectToInstantiate) {

            GameObject newCameraTransformElement = (GameObject)Instantiate (objectToInstantiate, positionToInstantiate, Quaternion.identity);
            newCameraTransformElement.name = objectToInstantiate.name;

            lastObjectInstantiated = newCameraTransformElement;

        } else {
            print ("WARNING: prefab gameObject is empty, make sure it is assigned correctly");
        }
    }

    public GameObject getLastObjectInstantiated ()
    {
        return lastObjectInstantiated;
    }

    public void addDialogContentToCharacter (Transform newDialogContentParent, GameObject newDialogContentOwner)
    {
        instantiateDialogContentSystem ();

        GameObject newDialogContentGameObject = getLastObjectInstantiated ();

        dialogContentSystem newDialogContentSystem = newDialogContentGameObject.GetComponent<dialogContentSystem> ();

        if (newDialogContentSystem != null) {
            newDialogContentSystem.setDialogOwnerGameObject (newDialogContentOwner);
        }
    }

    public void updateComponent ()
    {
        GKC_Utils.updateComponent (this);

        GKC_Utils.updateDirtyScene ("Update Dialog Manager " + gameObject.name, gameObject);
    }
}